Doc task

Current text: "The SSP Operator, ssp-operator, deploys the common templates,..."

Move "deploys the common templates" to Virt operator.

Original description:
Adjust https://docs.openshift.com/container-platform/4.14/virt/about_virt/virt-architecture.html#virt-about-virt-operator_virt-architecture

the common-instance-types are not deployed by the ssp-operator, but now from the virt-operator.